this generate tag <span class="cmp-link__screen-reader-only">(opens in a new tab)</span> is added by the
clientlib core.wcm.components.commons.site.link, this clientlib is part of embed properties of clientlibs-base
if you remove it's reference from embed properties as a test purpose, you see that will not generate the tag automatically
the purpose of this library is to only added this generated tag after your link,
you can check the code by accessing the crx in libs/core/wcm/components/commons/site/link
the best practice it's not edit anything in libs path but only in apps path, you can overlay this libray to change it's pattern or remove it from embed properties at clientlibs-base, however, this is just a observation not a recommendation do it at your own risk
regards,
ribeiro